• 한국컴퓨터정보학회논문지
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• 제15권5호
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• pp.33-38
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• 2010

본 논문에서는 USB 인터페이스 방식의 웹 카메라를 통해 입력받은 영상을 영상처리 기법을 통해 손의 움직임과 손가락 개수를 파악하여 실시간으로 마우스의 기능을 구현하는 알고리즘을 제안하였다. 웹 카메라로부터 입력받은 RGB 컬러모델 영상을 조명 변화에 강한 YCbCr 컬러 모델 영상으로 변환하여 휘도 성분을 제외한 색차 성분만으로 피부색을 추출해 이진화된 영상으로 만든다. YCbCr 컬러 모델을 이용하여 피부색을 추출할 경우, 주변 환경에 의해 정확한 손 영역을 추출할 수 없어 라벨링(labeling)과 열림(opening) 연산, 닫힘(closing) 연산을 수행하여 정확한 손 영역을 추출한다. 이렇게 추출된 손 영역의 중심을 이용하여 마우스 포인터를 이동시키며 손가락 개수를 이용하여 마우스의 클릭을 수행하였다. 구현된 제안 기법을 실험한 결과, 마우스 포인터 이동을 위한 기능 성공률은 평균 94.0%, 손가락 개수 인식률은 평균 96.0%로 실용화 가능성을 보였다.

• 지능정보연구
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• 제12권3호
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• pp.33-46
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• 2006

물류의 증가로 생산된 제품이 소비자에게 전달되기 전 저장하는 제품 창고의 운영과 유지는 제품원가의 큰 부분을 차지하게 되었다. 취급작업 횟수의 감소, 신속한 출고 작업, 제품의 효율적 관리를 위해 저장설비의 설치, 저장 공간의 추가 확보 등의 시설 투자 방법으로도 이런 문제를 해결 할 수 있지만 기존 저장 공간을 최대한 활용함으로써 취급작업 수를 줄일 수 있다. 저장시설 내에서의 운영방법에는 여러 가지가 있겠지만 저장 공간의 제약이 있기 때문에 제품을 겹쳐 쌓아야 하고 그 경우 반드시 재취급을 고려해야 한다. 재취급 문제는 창고의 취급 효율을 결정짓는 가장 중요한 문제이다. 따라서 창고의 운영 효율을 높이기 위해서는 재취급을 최소화할 수 있는 방법을 고려할 필요가 있다. 본 연구에서는 기대 재취급을 최소화하는 혼적결정 문제를 다루고자 한다. 혼적결정을 위한 최적화 모형을 제시하였고 해를 구하기 위한 유전자 알고리즘을 제시하였다. 이 연구결과는 컨테이너 터미널을 포함하여 재취급이 발생할 수 있는 창고의 운영에 활용될 수 있다.

• 대한조선학회논문집
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• 제54권5호
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• pp.387-392
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• 2017

There is a constant demand for hull variation related to ship design. Various input variables are generally given to achieve the objective functions assigned by each variation process. When dealing with geometric shapes accompanied by nonlinear operations during the variation process, vague relationships or uncertainties among input variables are commonly observed. Therefore, it is strongly recommended to identify those uncertainty factors in advance. A method to modify the shape of a closed hull form with a new area and a centroid had been introduced as a new process of hull variation. Since uncertainty between input variables still existed in the method, however, it was not easy for the user to enter the area and the corresponding centroid. To overcome this problem, a method is presented in this paper to provide the feasible region of centroids for a given area. By utilizing the concept and techniques used in the statistics such as the number of samples, probability, margin error, and level of confidence, this method generates the distribution of possible centroids along the regression curve. The result shows that the method helps the user to choose an appropriate input value following his or her design intention.

• 정보보호학회논문지
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• 제14권4호
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• pp.163-181
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• 2004

그룹 키 동의 프로토콜은 일련의 그룹을 형성하는 다수의 통신 참여자들이 공개된 통신망을 통해 안전하고 효율적인 방법으로 그룹의 세션키를 설정하기 위한 목적으로 설계된다. 하지만, 기존에 제안된 그룹 키 동의 프로토콜들은 모두 상당한 양의 통신 부하를 유발하기 때문에 전송 지연이 긴 WAN 환경에는 적합하지 않다. 이러한 네트워크 환경에서는 특히 라운드 복잡도와 메시지 복잡도가 프로토콜의 수행 시간을 결정하는 핵심 요소들로서, 무엇보다 이들을 줄이는 것이 효율적인 그룹 키 동의 프로토콜의 설계를 위해 중요하다고 할 수 있다. 따라서 본 논문에서는 라운드 수와 메시지 수 측면에서 효율적인 그룹 키 동의 프로토콜을 제안하고, 이의 안전성을 소인수 분해 문제에 기반 하여 랜덤 오라클 모델에서 증명한다. 제안된 프로토콜은 완전한 전방향 안전성과 최적의 메시지 복잡도를 제공하면서도 상수 라운드만에 그룹멤버의 변경에 따른 세션키 갱신을 수행한다.

• 한국식품영양학회지
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• 제24권3호
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• pp.396-405
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• 2011

The purpose of this study was to reduce safety accidents among food employees in contracted foodservice management companies, and to help provide high-quality foodservice and assistance. For this, a survey on the different opinions of workplace safety and education by employment type and employee perceptions of environment and safety at foodservice operations was carried out. The analysis showed that among the workers many women were irregular employees. For average age, between 40 and 49 was the most frequent, and for work duration, under one year was highest. Both regular employees and irregular employees deemed "enough staff" as the most major factor for good foodservice. The regular employees and irregular employees thought "high indoor temperatures and poor ventilation in the kitchen area" and "bad work cooperation between employees" as the main problems of foodservice operations, respectively. For satisfaction with the efficiency of foodservice production system, irregular employees had higher satisfaction than regular employees. Both regular employees and irregular employees thought "the number of foodservice employees" as the foremost improvement for safety-accident prevention and work-stress improvements. Regular employees, more than irregular employees, thought improvements in foodservice production systems would have a large affect on safety-accident prevention and work-stress improvements of food workers. Both regular employees and irregular employees thought "foodservice employees' safety consciousness" was an important part of safety-accident prevention. Likewise, they responded that "lectures by the person in charge of safety education" was a good methods of safety education, and "once a month" was the best period for safety education. For the difference in perceptions of environment and safety in foodservice systems, regular employees had a higher perception of safety than irregular employees.

• 수산해양기술연구
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• 제32권3호
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• pp.223-234
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• 1996

Distribution of Anchovy was analyzed from the experimental operations by the small anchovy drag net fishery in the coastal area of Yang yang - gun and Myongju - gun of Kangwon Province from October to December, 1994. Temperature ranged from $11.4^{\circ}C.$to $17.4^{\circ}C.$throughout the experimental period. Fishes caught by experimental operation vessels were composed of anchovy, Clupanodon Punctatus, Pleuronectidae, Tetraodantidae, Acanthopagrus Schlegeli etc., and the anchovy occupied more than 99.6% of the total catch. Anchovy was characterized by the most abundance of the catch for the individual less than 6cm and the gradual increase after October for those larger than 6cm. CPUE(catch per tow) of anchovy was 684kg in October, 784kg in November, 1,590kg in December and mean CPUE of 3 months from October to December was 1,066kg. Fishing grounds of anchovy were formed in coastal area, from $37^{\circ}$45'N to $38^{\circ}$04'N, off Kangwon Province. Distribution density of anchovy in Chumunjin - up, Kyohang - ri Sachon - myon, and Sachonjin - ri coasts was higher than the other areas. Anchovy caught in this surveyed area was recruited from July to September at the length class between 2cm and 3cm, and grew to the sizes between 4cm and Bem in October, between 5cm and tcm in November, between tcm and Bem in December. Recruitment of anchovy increased from July to September and suddenly decreased after September. Individual number of the population was the largest during the period from August to October and gradually decreased after October. Biomass continuously increased after August, and was the largest in December.

• 대한기관식도과학회지
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• 제13권2호
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• pp.45-49
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• 2007

Background and Objective : Laryngeal Papillomatosis (LP) is the most common benign neoplasm of the larynx, but it tend to recur and it makes eradicating difficult. Meticulous $CO_2$ laser excision has been the most effective treatment to date. This article analyzes the clinical feature and therapeutic results of 42 LP patients who were undergone $CO_2$ laser excision. Methods : Forty two patients with recurrent LP were treated with $CO_2$ laser. And their medical records were reviewed retrospectively. Demographics, chief complaints at onset, initial distribution of papillomas, number of operations performed on each patient, and current results were evaluated. Results : Male in their twenties and forties are dominant in number in patient number. Most common site was anterior one thirds (69%) of glottis area (86%). LP recurred in 17 cases (40%), and in 4 cases, the lesion extended over the original margin. Patients were undergone surgery $1.62{\pm}0.87$ times, $2.53{\pm}0.72$ in recurred cases. Mean relapsing time was 6 momths (from 1momth to 8years). Ant. laryngeal web occurred in 2 cases (4.8%) and 1 case was combined with squamous cell carcinoma. Conclusion : Meticulously performed $CO_2$ laser excision can achieve significant voice and airway improvement and clinical cures. The $CO_2$ laser through microdirect laryngoscopy allows more precise and bloodless removal of papillomas.

• 방사선산업학회지
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• 제9권3호
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• pp.119-126
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• 2015

In Shinjeong-dong of Jeongeup, there are three government-supported research institutes and an RFT industrial complex which is currently being established. Increased human activities can affect flora and fauna as a man-made pressure onto the region. As a baseline study, status of exotic plants was investigated prior to a full operation of the RFT industrial complex. A total of 54 species and 1 variety of naturalized or introduced plants were found in the study area. Among them, three species (Ambrosia artemisifolia var. elatior, Rumex acetocella and Aster pilosus) belong to 'nuisance species', and four species(Phytolacca americana, Iopomoea hederacea, Ereechtites hieracifolia and Rudbeckia laciniata) to 'monitor species' designated by the ministry of Environment. Some of naturalized trees and plants were intentionally introduced in this area, while others naturally immigrated. Physalis angulata seemes to immigrate in the study area in the form of mixture with animal feeds as its distribution coincided with the transportation route of the animal feeds. Liquidambar styraciflua is amenable to the ecological investigation on the possible expansion of the species to the nearby Naejang National Park as its leave shape and autumn color are very similar to those of maple trees. The number of naturalized plants around the RFT industrial complex will increase with an increase in floating population, in human activities in association with constructions of factories and operations of the complex. The result of this study provides baseline data for assessing the ecological change of the region according to the operation of the RFT industrial complex.

• 한국국방경영분석학회지
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• 제2권1호
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• pp.127-143
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• 1976

The purpose of this thesis is to study the optimal arrangement of aircraft instrument panels through the human factors approach. Human factors engineering is the process of effectively fitting the human component to the machine component in any man-machine system. The human factors. are especially important to an aircraft pilot who must constantly shift his attention between the instrument panel within the cockpit and the surrounding area of the aircraft. The preliminary part of this study is to find the general patterns of the Korean pilot's eye movements during their various flying maneuvers, and which instruments require the most attention while in flight. It is assumed that all pilots have a general pattern of eye movement when observing the aircraft instrument panel and that an optimum arrangement would be to minimize the eye travel distance between instruments. In this thesis the arrangements of instruments is taken to be the independent variable and the eye travel distance between instruments the dependent variable. la order to compile the information necessary for this study, sixty Korean Air Force pilots were interviewed and requested to complete information forms. These information forms listed various flying maneuvers and listed each instrument used on the instrument panel. The compilation of the information on these completed forms listed the instruments most frequently used by the pilots. The second part of this study was to determine the optimum instrument arrangement. It was necessary to study the various number of possible arrangements of instruments depending upon the number of instruments involved. Therefore, these instruments are grouped by two major functions, The flight instruments were subdivided into three groups, and the engineering instruments were subdivided into six groups. With this subdivision we arrive at the possible number of arrangements of 4,320. Through the simulation method, total eye travel distance for each of these 4,320 arrangements is calculated and the arrangement which appears to be of optimum distance between the most frequently used aircraft instruments is determined. The results of this study indicate that the optimum distance between instruments would be 33,028cm and that the corresponding distance of the instrument panel now being used is 34,288cm. Therefore, an increased efficiency of $3.8\%$ would be realized if the existing aircraft instrument panel were re-arranged according to layout proposed in this thesis.

• 수산해양기술연구
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• 제46권4호
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• pp.476-486
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• 2010

Fishing efficiency of a trawl vessel can be enhanced by increasing the swept area per unit time, which can be attained either by increasing the mouth size of the net, or by increasing the towing speed. To improve fishing and fuel efficiency of trawl vessels targeting fishes of greater mobility, in which the towing speed is more critical in determining fishing efficiency, we conducted a series of model tests to evaluate the performance of the newly-designed nozzle propeller before installing it in a trawl vessel to verify its towing speed and fuel efficiency in the sea. By conducting further model tests in the experimental basin, we redesigned the propeller of stern trawler to improve the resistance and propulsion performance. Through actual fishing operations, we evaluated the improvement in fuel and fishing efficiency by installing the new nozzle propeller. The trawling speed increased by 0.6kts at the same engine power (RPM), while the engine margin increased by more than 20%. The increased towing speed by installing the redesigned propeller is expected to enhance fishing performance through increasing the number of hauling- and casting operations per unit times, while shortening the towing duration. Analysis of the Catch-Per-Unit-Effort (CPUE) data indicated that the mean CPUE of trawl fishery increased from 3.04kg/m in year 2007 to 6.15kg/m in year 2008, confirming enhanced fishing efficiency by adopting the redesigned propeller.